Commercial real estate has its own language and knowing it is critical to your success. If you are new to the commercial real estate world these terms might be new to you. NOI determines the revenue and profitability of invested real estate property after subtracting necessary operating expenses. In real estate how proformas are calculated and the length of the proforma varies. SDIRA (Self Directed Individual Retirement Account) -A type of IRA retirement account used by individuals to invest in real estate.